21 is what percent of 12147 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 12147 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 12147, so we can write it down as 100%=12147.
4. We know, that x% equals 21 of the output value, so we can write it down as x%=21.
5. Now we have two simple equations:
1) 100%=12147
2) x%=21
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=12147/21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21 is what percent of 12147

100%/x%=12147/21
(100/x)*x=(12147/21)*x       - we multiply both sides of the equation by x
100=578.42857142857*x       - we divide both sides of the equation by (578.42857142857) to get x
100/578.42857142857=x
0.17288219313411=x
x=0.17288219313411

now we have:
21 is 0.17288219313411% of 12147